Windows Phone is now the third-leading mobile phone platform, more than tripling its market share year-over-year and more than doubling unit sales while pushing past a slumping BlackBerry.

And Windows Phone could jump into second place quicker than you think.

While they’re not Android or iOS-style numbers, Windows Phone sold 7 million units in the first quarter of 2013 for 3.2 percent market share, according to the latest IDC report. Meanwhile, BlackBerry sold 6.3 million units, down a third from the previous year, for 2.9 percent market share — less than half of its share just a year ago. Market leader Android took its customary massive 75 percent of the market, and Apple’s iPhone slipped from 23 percent global market share in 2012 to 17.3 percent share.

“Windows Phone claiming the third spot is a first and helps validate the direction taken by Microsoft and key partner Nokia,” the IDC’s Kevin Restivo said in a statement. “Given the relatively low volume generated, the Windows Phone camp will need to show further gains to solidify its status as an alterative to Android or iOS.”

Those further gains are possible over the next year or two as Microsoft’s primary phone parter, Nokia, transitions to an all-smartphone lineup.

Part of Apple’s quarterly weakness was the company’s lack of any new hardware or significant new announcements. That made Apple slip to its lowest global smartphone market share in years, now less than a quarter of Android’s size, with only 37.4 million iPhones sold to Android’s 162.1 million. But systemically, Apple is falling out of the race for smartphone supremacy. And that puts Apple at risk of being in Microsoft’s sights for the number two position in the global smartphone market share battle.

How?

Nokia is going all in on Windows Phone — mostly by necessity — and now accounts for 79 percent of all Windows Phone sales. The Finnish company has sold over 20 million Windows Phones to date, which is not bad, considering the challenges of Android, iOS, and Microsoft’s stutter-stepping from Windows Phone 7 to Windows Phone 8.

Global smartphone market share, Q1 2013

But the real opportunity for both Microsoft and Nokia will come as Nokia continues its transition from feature phone sales over to Windows Phone. The company still sold something like 55 million feature phones in the first quarter of 2013, and while those cheap phones are going largely to developing nations, they will transition at some point to Windows Phone.

Those feature phones sales are decreasing, and the transition from cheap feature phone to somewhat more expensive Windows-based smartphones will decrease them still more, but they will be higher-value sales.

Microsoft will begin sales of the Surface Pro this weekend. The Pro and RT model look alike, but that’s where the similarity ends.

The Surface RT (left) and the Surface Pro.
Microsoft
With the Surface Pro set to go on sale Saturday, consumers will have a pretty stark choice between two Microsoft tablets that look remarkably similar.

When I walked into my local Los Angeles Microsoft Store earlier this week — where the Pro was already on display next to the RT model — it was hard to tell right off the bat which Surface was which.

Not surprising, since both tablets display the same Metro screen and there’s a mere 4.2mm difference in thickness.

So, let’s recap what sets the Pro apart from the RT version.

Price: The RT model with Microsoft Office starts at $499. The Pro without Microsoft Office starts at $899.

Compatibility: The RT model is not compatible with older Windows applications. The Pro is.

Thickness/weight: The Pro model is about 0.5 inches and 2 pounds, the RT model about 0.35 inches and 1.5 pounds.

Disk space/storage tech: The Pro comes in 64GB and 128GB versions, RT in 32GB and 64GB. Note that the Surface Pro’s solid-state drive is fast, the same class of speedy SSDs you find in mainstream laptops.